seems no longer in use/accessible.

The disposal of the cassette and the waste water is right next to the workshop. we just managed to empty our cassette, then an employee from the workshop came and said we had been blocking the workshop for an hour. We then drove away...

Neat service. Accessible by taking the parking lot shop and immediately turn right towards "Werkstatt". The service area is a little further than the showroom entrance for large garage doors.